Features: An easy one-step connection of wires, soldered, insulated, and sealed Polyolefin tubing in outside and hot melt adhesive in inside Solder and seal and with advanced waterproof function Polyolefin heat shrink butt connectors improved pullout strength, provides a seal, strain relief, cable check, and insulation Transparent heat shrink sleeve allows for precise visual inspection Greater pull strength Ideally used in electronics, railway, marine, automobile, motorcycle, aerospace, and other outdoor applications. Specification: Color: Red, Blue, White, Yellow, Black Red connector : Suit Cable / Wire Size 22-16 AWG 0.5-1.5mm2 (35PCS) Blue connector : Suit Cable / Wire Size 16-12 AWG 1.5-2.5mm2 (30PCS) Yellow connector : Suit Cable / Wire Size 12-10 AWG 4.0mm2 (10PCS) White connector : Suit Cable / Wire Size 26-24 AWG 0.25-0.34mm2 (25PCS) Black Heat Shrink Sleeve (3.0mm, 20mm Long) (300pcs) Package include: 400PCS Heat Shrink Sleeve 1x Storage Case Note: Please allow a 1-3mm difference due to manual measurement. Due to light and screen differences, the item's color may be slightly different from the pictures.